hey guys.
this is all probanily pretty bais cfor you all but its confussing the hell out of me...i have a biology workbook and cant find answers to the following questions...if anyone cal help itd be awesome.

1-how many of each of the 3 types of blood cells are found in one litre of blood?

2- where are dyes commonly injected to study the coronary circulation?

3- how does the type of epithelium alter down the respiratory pathway?

4-how many chromosomes would there be in the new cell if the egg and the sperm each had 46 chromosomes?

5-where could you palpate the doctus deferns?

thanks guys...any ffedback would be awesome even if its just sites or books that you can give me references for...cheers

3. Do you mean what types of epithelium is there along the respiratory pathway?
If so, than
Nose: not sure, but i guess pluristratified pavimentos keratinizated(like the skin). Also you ned to take into consideration the bipolar neurons needed to smell.
Pharynx: pluristratified pavimentos unkeratinizated(like the esophagus)
Larynx- Mainly unistratified cilindrical with cilia.At the level of the vocal cords it is pluristratified pavimentos
Trachea-pseudostratified
Main Bronchi-pseudostratified
Bronchioles-unistratified cubic

Real hard question!!!

"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter